After the battle with Shan. The T-Dolls along with the remaining survivors of Humanity stood their ground to rebuild civilisation, and with the return of their leader, they are no confident of their strength and survival, but an ancient opponent awakes from his long slumber and rises from his grave to face the T-Dolls in the Cold Storm.

Twin sisters Sayo and Hina temporarily attend Middleton High School to help super-spy Kim Possible stop the evil Dr. Drakken and his serious scheme to take over the world. However, things go different from planned when new boys Eric and Johnny ask Kim and Sayo to the upcoming prom.

After the group known as "Gateway" was formed by Nishikino Kirei, every band and idol group from the music industry saw the immense potential and danger to their ranks due to the power and popularity of Gateway, this is a musical warfare.